1640555004 has 48 divisors (see below), whose sum is σ = 4254768000. Its totient is φ = 487755840.

The previous prime is 1640554997. The next prime is 1640555011. The reversal of 1640555004 is 4005550461.

It is an interprime number because it is at equal distance from previous prime (1640554997) and next prime (1640555011).

It is a super-2 number, since 2×1640555004² = 5382841442298880032, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110254 + ... + 124245.

It is an arithmetic number, because the mean of its divisors is an integer number (88641000).

Almost surely, 2^1640555004 is an apocalyptic number.

It is an amenable number.

1640555004 is an abundant number, since it is smaller than the sum of its proper divisors (2614212996).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1640555004 is a wasteful number, since it uses less digits than its factorization.

1640555004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234570 (or 234568 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 1640555004 is about 40503.7653064502. The cubic root of 1640555004 is about 1179.4067217761.

The spelling of 1640555004 in words is "one billion, six hundred forty million, five hundred fifty-five thousand, four".